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Sewage treatment plant, Lynnville, Iowa. NPDES permit IA0041971, in force until Jul 31, 2031. Last 12 months: over a limit 2 times (last November 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | BOD, carbonaceous [5 day, 20 C], 30-day average | 36 | ≤ 25 mg/L | 44% |
| November 2025 | Solids, total suspended, 30-day average | 94 | ≤ 80 mg/L | 18% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| E. coli, geometric mean | 128 #/100mL (Mar–Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.7 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 12.7 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.3 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.6 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 21.7 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 11.5 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 12.1 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 12.2 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.3 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.4 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 10 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 34.1 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 21.6 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.5 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.6 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 15.7 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 7.2 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 24.8 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 17.8 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.2 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 11.5 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.4 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 12.7 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 43.4 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 14.8 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.3 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.8 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 15.7 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 11.5 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.3 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 34.1 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.6 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 12.2 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 12.9 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.6 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 21.6 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.4 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 21.7 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.3 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 10 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 7.2 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 24.8 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.2 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 17.8 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 11.5 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.4 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 21.7 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 74.3 lb/d (Jan) | new | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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